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Email server rDNS record query

Posted on 2013-05-23
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Last Modified: 2013-05-28
HI there,
I have a client who recently moved premises. We moved the SBS server and re-configured both internal and external IP addresses. I changed the public IP address in their DNS registrars control panel to point to the new public IP address assigned on the new firewall to their mail server. Mail was flowing within 1 hour. So far so good. After approximately 2 weeks the IP address of the gateway router ended up on a spamhous blocklist. From what I could decipher it looks like it was because there is no reverse DNS PTR record. The DNS registrar has told me I need to do this at the server - I have never had to do that before. I have moved many a server in the past and this is the first time this has happened and I am unsure of what to do. The errors in some NDR's include the name of the service provider who supplied the fibre connection. So, where does the reverse lookup record reside? Is it at the DNS registrar? Or the internet service provider? Or directly on the server? If it's on the server do I create a new reverse DNS zone to match the mx record and the IP address? I appreciate any help with this. The client is trying to send out invitations to their grand opening and as you can imagine they are not pleased.
Regards
Gerry
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Question by:murphyge
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Accepted Solution

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s3e3 earned 500 total points
ID: 39191174
Reverse DNS Resides on the Internet Provider Side. You need to ask them since you do not own that IP address.

In the short term you can also look at using a smart host to relay all the email from exchange server to your ISP's mail server. This works well because the SMART Host will have a clean reverse DNS entry and you don't have to worry about blacklists.
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Expert Comment

by:Ben Hart
ID: 39191183
s3e3 is not entirely correct.  For example the company I work for.. not huge by any means but we host our own DNS.. our ISP does not control our DNS records.  But you should know if you guys have an externally available DNS/BIND server in house.

Also this is not done on your Exchange server, unless you have the DNS role installed alongside Exchange which Im fairly confident is NOT supported by Microsoft.

However I will agree that if you had NDR's mentioning the provider then it's safe to say that in your case the ISP does host that information.
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Expert Comment

by:s3e3
ID: 39191204
Reverse DNS entries are normally managed by the ISP for most customers with a small block of IP addresses. Like I said, a simple phone call to the ISP will be sufficient to get the correct information.
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Author Comment

by:murphyge
ID: 39191237
Thanks for the feedback both. I have been on to the ISP and logged a ticket with them, there seems to be some confusion about this though, one support guy I spoke to says it's not their responsibility. I will escalate to them again.
Ubadmin - the client does not host his DNS records.
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Expert Comment

by:Ben Hart
ID: 39191247
Here's hoping you get a TSR who is helpful.
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Author Comment

by:murphyge
ID: 39191317
Here is the response I got from the support:

Hi,

We currently have an engineer working on this request. The range that the IP address is part of is not set up in a way that we can apply PTR records as we normally do, that is what is causing the delay in this request.

RT: 963837

Regards,

I don't know what to think.
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LVL 8

Expert Comment

by:s3e3
ID: 39191372
I would try using the smart host configuration, it's very easy and works well.
Once the rDNS is sorted out you can always switch back.

Search EE for smart host config, it's not hard to accomplish.
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LVL 14

Expert Comment

by:Ben Hart
ID: 39191390
And you asked them to edit the clients reverse DNS pointers correct?  I can't even take a guess as to how they would normally setup pointers...
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Author Comment

by:murphyge
ID: 39191491
s3e3 I'll talk to them about using the smart host config.

ubadmin Yes I did.

Thanks again, I'll update tomorrow.
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LVL 14

Expert Comment

by:RickEpnet
ID: 39193141
Use a Smarthost much easier. Most of my customers we use a Smarthost. If you have an EC2 server on amazon you can use there SES for free for up to 2000 emails a day.
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Author Comment

by:murphyge
ID: 39201232
Late Update - issue resolved. The ISP created the record. I just needed to talk to someone in support who knew what they were talking about.
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